Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b0113a3110d42b…

MALICIOUS

PDF

78.5 KB Created: 2021-05-07 10:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 096e1c8034ff6dfe0a9836ea3c299ecc SHA-1: 20fa7b3227f2ee4f02678ffa4a9b50dc0fb4cb80 SHA-256: 41b0113a3110d42bc661f9109a490cca55529a80fd0122ebe44c87de27a0cd57
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=what+setting+to+use+on+cricut+for+oracal+651 PDF link annotation
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/67ba6.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/zawenowafovujawpdo9d.pdfIn PDF document text
    • http://xadimilok.iblogger.org/best_browser_for_mi_android_tv.pdfIn PDF document text
    • http://ruwozapezorirar.iblogger.org/liribizivorexudivola.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/ragebas.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/lubagubumovegex-jijeredejeraw.pdfIn PDF document text
    • https://bawokuxuduxiv.weebly.com/uploads/1/3/1/8/131856062/680696.pdfIn PDF document text
    • http://delibopujex.iblogger.org/how_to_convert_word_document_to_on_android_phone.pdfIn PDF document text
    • http://zunanifuxomo.iblogger.org/geometrical_optics_questions.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/how_to_catalogue_a_coin_collection.pdfIn PDF document text
    • http://wisitens.online/can_scoliosis_be_cured_with_exerciseo5srn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faleferesevo.onlinewebshop.net/47172635754.pdfIn PDF document text
    • http://zomimuju.rf.gd/zujukumabopekevezidesus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97136266-7421-4554-91bf-33ffcab90a41/how_to_set_24_hour_timer_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9206bca-7204-4f0d-b523-aa79266a4f55/how_do_i_get_the_street_view_on_google_maps.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/86078701667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ccb65d5-1839-4bb4-bde6-00a9a16607c7/7149356150.pdfIn PDF document text
    • http://topeleseluvon.rf.gd/zuvisom.pdfIn PDF document text
    • http://bopamebedozupux.epizy.com/xalisepurebumatotisube.pdfIn PDF document text
    • http://lotarikavim.rf.gd/benami_transactions_prohibition_act_2020.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/cholesterol_lowering_diet_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa03d24-0f04-4c74-89f5-e951e44f2330/how_much_does_a_mile_of_road_cost.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 5484 bytes
SHA-256: 469373b06a31167153af960ce3577d79a2eb4f757319f68bda5217c35dfcd541
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 11436 bytes
SHA-256: 0ad8e0a8267ff28b75bdc32e8378a226ce33a20f0a88ca17b4f0289dfda77d55

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